Does emotional intelligence change across the lifespan? A researcher conducts a longitudinal study by collecting data on the same people across 20 years. Emotional intelligence was quantified at ages 4, 14, 24, and 34 years of age. Emotional intelligence was quantified using the self-report Bar-On EQ-I, which ranges from 0 110, and is considered "scale" in nature. Assume data meets all assumptions for a parametric test. Question: What is the null hypothesis for this scenario?